全封闭舱内爆炸载荷作用下薄板变形研究

  目的  旨在研究舰船结构在战斗部舱内爆炸下的耦合毁伤效应。  方法  以带壳弹起爆试验验证SPH-FEM耦合数值方法的有效性，对实船舱段缩比模型起爆试验进行数值计算，分析战斗部舱内爆炸时破片与冲击波对舰船结构的耦合毁伤效应。  结果  结果显示，在战斗部舱内爆炸作用下，金属壳体产生的随机高速破片群具有特殊的空间分布特征，率先引起当舱结构的局部破坏，冲击波压力加剧了局部破坏效应，结构破口进一步对舱内爆炸冲击波的传播扩散空间产生了影响，进而对相邻结构造成毁伤。  结论  研究表明：简单地将战斗部等效为裸装药的方法不能真实反映战斗部舱内爆炸对舰船结构的毁伤效果；采用SPH-FEM耦合的数值方法能够良好地还原试验中战斗部对舱室结构的毁伤模式。

Suggestion of a new dimensionless number for dynamic plastic response of beams and plates

  Objective  This paper studies the coupled damage effects of a ship's structure due to the internal blast loading of a warhead.   Methods  Blast tests with cased charge data are conducted to verify the effectiveness of the coupled SPH-FEM approach, and numerical calculations are then performed on real ship compartment scale model tests to analyze the coupled fragmentation and shockwave damage effects of an explosion in a confined cabin.  Results  The results show that the fragments caused by the detonation of the warhead will first cause local damage to the cabin structure. The shockwave will exacerbate the local damage, and blasted openings will further increase the space for the propagation and diffusion of the shockwave inside the chamber, which will in turn cause damage to the adjacent structures. The simple equivalence of the warhead to a bare charge does not give a true picture of the effect of the warhead on the ship's structure, and fragmentation plays a significant role in the detonation of the warhead.  Conclusions  The results of this study show that employing the coupled SPH-FEM numerical method to calculate the coupling damage effects on a ship's structure can accurately reproduce the warhead damage pattern in tests, thereby providing support for the improved assessment of the damage of naval structures under warhead detonation.